METHOD FOR PREPARING HIGH CONCENTRATED ULTRAFINE METAL PARTICLE SOLUTION

摘要

PURPOSE: A method for preparing a high concentrated ultrafine metal particle solution in which uniform metal particles having ultra-fine particle size of 100 nm or less are dispersed by effectively controlling agglomeration and growth of particles in the metal particle production process. CONSTITUTION: In a method for producing metal particles by adding reducing agent to a metal salt aqueous solution, the method for preparing a high concentrated ultrafine metal particle solution comprises the process of producing ultrafine metal particles by adding the reducing agent to the polymer-metal salt complex after forming polymer-metal salt complex by adding a polymer electrolyte to the metal salt aqueous solution, wherein the metal salt is nitrate, sulfate, carbonate or chloride of metal ions selected from silver (Ag), nickel (Ni), copper (Cu), gold (Au), cobalt (Co) and palladium (Pd), wherein the reducing agent is NaBH4, LiAlBH4, hydrazine, hydrazine hydrate, formaldehyde or a mixture thereof, wherein 0.2 to 2 equivalents of the reducing agent are used for 1 equivalent of the metal salt, wherein the polymer electrolyte is dissolved thus dissociated into water since dissociating group exists in polymer chains of the polymer electrolyte, wherein the polymer electrolyte is selected from a polymer material to which a dissociating group selected from polyacrylic acid, polymethacrylic acid, polystyrene sulfonate, lignin sulfonate and salts thereof is bonded, and a copolymer of the dissociating group bonded polymer material and other aqueous polymer without dissociating group, wherein 0.1 to 30 weight parts of the polymer electrolyte are used for 1 weight part of the metal salt, and wherein the produced metal particles are ultrafine powder having particle size of 100 nm or less.